>Most whites and Asians chose to came to America to better>themselves. It is possible that they were more ambitious, hard>working or adventurous than the group that stayed at home. It is>quite likely that the whites and Asian that decided to come to>America are not typical of the population in Europe or Asia.

Ambition, adventuresomeness, industry -- you consider these to be genetic?
Inheritable?
Additionally, by this line of reasoning, wouldn't this mean that the
descendents of Europeans that participated in the western expansion of the
US have a higher mean IQ than those who stayed on the East Coast? Any data
around that shows an East-West anomaly?

>It is possible that those Europeans and Asians who decided to come>to America had a somewhat higher IQ than those who did stayed in>Europe and Asia. This could explain why in the US that the whites>and asians have higher median IQs.

Maybe -- for those who came willingly?
Doesn't address "regression to the mean" though, if my great-great-grandpa
was bright enough to come here, what does that say about me -- not much I
suspect.